The humerus radius and what articulate to form elbow joint?

The elbow joint is formed by the articulation of three bones: the humerus, the radius, and the ulna. The humerus connects to the radius and ulna at the elbow, allowing for flexion and extension of the forearm. The trochlea of the humerus fits into the ulna, while the capitulum articulates with the head of the radius, facilitating coordinated movement between the upper arm and forearm.